| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 | 
                                    
                                    0%
                                 | 
| 1 | Very easy | 99 | 
                                    
                                    8.3%
                                 | 
| 2 | Easy | 194 | 
                                    
                                    16.2%
                                 | 
| 3 | Difficult | 113 | 
                                    
                                    9.4%
                                 | 
| 4 | Very Difficult | 73 | 
                                    
                                    6.1%
                                 | 
| 7 | Not applicable | 720 | 
                                    
                                    60%
                                 | 
| 8 | Refused | 0 | 
                                    
                                    0%
                                 | 
| 9 | Don't know | 1 | 
                                    
                                    0.1%
                                 |